Branch Retinal Artery Research Articles

RETINAL ARTERIAL MACROANEURYSM COMBINED WITH BRANCH RETINAL ARTERY OCCLUSION: Literature Review.

To summarize the causes of retinal arterial microaneurysm combined with branch retinal artery occlusion. The case reports of retinal arterial microaneurysm combined with branch retinal artery occlusion were searched in PubMed, Web of Science, and CNKI databases before May 1, 2024. A total of nine participants from nine case reports were included to analyze factors leading to complications. The reasons for this complication are as follows: complications during photocoagulation therapy. Intraretinal hemorrhage and exudation result in compression of adjacent or distal arteries, resulting in branch retinal artery occlusion. Embolus dislodgement or intraarterial embolus formation can block the artery, damage the wall, and provide conditions for the development of retinal arterial microaneurysm. In addition, it is necessary to be alert to the optic disk macroaneurysm, if hemorrhage or embolus formation in the macroaneurysm will affect the blood supply of the downstream artery, affecting a large range of the retina. Based on the review of case reports, we found that retinal arterial microaneurysm and branch retinal artery occlusion can cause each other. Acute vision loss can result when a complication occurs. In addition, retinal vascular diseases can reflect the whole body, suggesting that ophthalmologists need to pay attention not only to the patient's fundus but also to the patient's systemic diseases.

A Rare Case of Papillary Fibroelastoma of the Aortic Valve Causing both an Embolic Ischemic Stroke and a Retinal Artery Branch Occlusion

A Rare Case of Papillary Fibroelastoma of the Aortic Valve Causing both an Embolic Ischemic Stroke and a Retinal Artery Branch Occlusion

Susac syndrome: ophthalmological and auditory manifestations in a patient with headache: case report

IntroductionThe first case reports of Susac Syndrome emerged in 1979 due to two young female patients presenting with the clinical triad of multifocal encephalopathy, occlusion of the central retinal artery branch, and sensorineural hearing loss, as well as histopathological findings of microinfarctions in the gray and white matter of the brain. The clinical features of the syndrome have been documented in approximately 500 cases published worldwide, making it extremely rare. Headache is a prominent complaint by patients with Susac syndrome. Its pathophysiology remains unknown, with immune and genetic factors being most related to the retino-cochleo-cerebral clinical manifestations. Since its first description, the scientific community has been paying greater attention to the syndrome, especially with advances in medical technology and the availability of complementary exams.Case reportIn this study, We present a case report of a woman experiencing progressive pulsatile temporal headaches for two years, associated with decreased visual acuity for three months and simultaneous hypoacusis on the left, who was incorrectly diagnosed and treated for multiple sclerosis.CommentThe literature review discusses Susac Syndrome and its microvascular complications, highlighting the multidisciplinary approach necessary for accurate diagnosis and comprehensive long-term management.

Geriatric ophthalmologic co-management : A case report of interdisciplinary collaboration

This case report details the assessment and interdisciplinary collaboration in the management of an 81-year-old patient presenting with acute visual impairment, dizziness, general weakness, gait disturbances and fear of falling. A holistic geriatric evaluation revealed orthostatic dysregulation and an underlying multifactorial gait disorder exacerbated by visual impairment. Ophthalmological findings included left central retinal artery branch occlusion and cataracts. A comprehensive geriatric assessment showed frailty, impaired mobility and decreased functional abilities. Subsequent patient-centered interdisciplinary approaches included treatment for retinal ischemia, orthostatic testing, medication reconciliation, physiotherapy and occupational therapy. This case emphasizes how interdisciplinary collaboration between ophthalmology and geriatrics enables proactive assessment and intervention to reduce the risk of functional decline and loss of autonomy in visually impaired patients, which is of particular relevance considering the increasing prevalence of visual impairment in the ageing population.

Aetiology, Diagnosis and Treatment of Arterial Occlusions of the Retina-A Narrative Review.

Arterial occlusions of the retina are potentially sight-threatening diseases which often result in profound visual loss. The aim of this narrative review is to provide an overview of the aetiology, discuss major risk factors, describe the management and systemic assessments and evaluate existing therapies. For this review, an extensive literature search in PubMed was performed. Emboli from the heart or the carotid arteries can cause ophthalmic artery occlusion (OAO), central retinal artery occlusion (CRAO) and branch retinal artery occlusion (BRAO). Most patients with arterial occlusions have vascular risk factors such as arterial hypertension, hyperhomocysteinaemia, carotid stenosis and atrial fibrillation, which also increase the risk of cerebral stroke and myocardial infarction. Therapies such as ocular massage, thrombolysis and anterior chamber paracentesis have been suggested but are still equivocal. However, it is evident that retinal artery occlusion should be immediately treated and accompanied by interdisciplinary collaboration, since early diagnosis and the proper treatment of possible risk factors are important to reduce the risk of further damage, recurrences, other vascular diseases and mortality.

Testosterone-Induced Central Serous Chorioretinopathy Mimicking a Choroidal Mass.

To describe a case of supplemental testosterone-induced central serous chorioretinopathy (CSCR) mimicking a choroidal mass in a 63-year-old male. Case report. A 63-year-old male patient on self-prescribed supplemental testosterone with CSCR mimicking a choroidal mass. A 63-year-old male presented with new onset vision loss, subretinal fluid, and choroidal mass in his left eye. Intravenous fluorescein angiography showed an enhancing choroidal mass involving the fovea. B scan ultrasonography revealed diffuse choroidal thickening. Given concern for a diffuse uveal melanoma, the lesion was biopsied showing non-diagnostic rare, atypical melanocytes. Four months after initial presentation, the patient was diagnosed with polycythemia vera. Fourteen months after diagnosis, he admitted to testosterone supplementation. Upon cessation of the testosterone supplement, the lesion progressively flattened to a chorioretinal scar with subretinal fluid resolution, and the return of normal choroidal thickness over the next 14 months. Testosterone supplementation has been linked to erythrocytosis and polycythemia vera. In the retina, testosterone supplementation has been linked to CSCR and both central and branch retinal artery and vein occlusions. This case demonstrates the importance of inquiring about all prescribed and over the counter medications in patients presenting with retinal lesions of unknown origin.

Prepapillary vascular loops - A new classification.

Prepapillary vascular loops are a type of congenital vascular anomaly seen on or around the optic disk. Patients with this condition are usually asymptomatic and are detected incidentally on routine fundus examinations. Differential diagnosis for this condition includes neovascularization of the disk and collaterals on the disk. Prepapillary capillary loops are not associated with any systemic condition. They are usually unilateral in presentation, but can rarely be bilateral. To discuss the new proposed classification of prepapillary capillary loops. : Prepapillary capillary loops are classified based on their location around the disk, loop characteristics such as elevation, shape, and covering, and presence of vitreoretinal traction. The most common vascular loops are arterial in origin and rarely venous in origin. They can sometimes be associated with spontaneous and recurrent vitreous hemorrhage, branch retinal artery or vein occlusion, and subretinal hemorrhage. It is an important differential diagnosis in spontaneous vitreous hemorrhage. Treatment is symptomatic. : https://youtu.be/gbq_oP7Y2q4.

Retinal branch artery occlusion combined with moyamoya disease in young adult.

Retinal branch artery occlusion combined with moyamoya disease in young adult.

Effects of Intravitreal Ranibizumab Injection on Peripheral Retinal Microcirculation and Cytokines in Branch Retinal Vein Occlusion with Macular Edema.

Background and Objectives: To investigate peripheral blood flow in retinal vessels and vessel diameters after intravitreal ranibizumab injection (IRI) and the relationship between these parameters and cytokines in branch retinal vein occlusion (BRVO) with macular edema. Materials and Methods: We assessed relative flow volume (RFV) and the width of the main and branch retinal arteries and veins in the occluded and non-occluded regions before and after IRI in 37 patients with BRVO and macular edema. Measurements were made using laser speckle flowgraphy (LSFG). When performing IRI, we obtained samples of aqueous humor and analyzed them using the suspension array method to evaluate vascular endothelial growth factor (VEGF), placental growth factor (PlGF), platelet-derived growth factor (PDGF)-AA, soluble intercellular adhesion molecule (sICAM)-1, monocyte chemoattractant protein 1 (MCP-1), interleukin (IL)-6, IL-8, and interferon-inducible 10-kDa protein (IP-10). Results: In both retinal regions, before and after IRI, the RFV in the main artery and vein showed a significant correlation with the summed RFV in the respective branch vessels 1 and 2. In the occluded region, the RFV in the main vein was significantly negatively correlated with MCP-1, PDGF-AA, IL-6, and IL-8; the RFV in branch vein 1 was significantly negatively correlated with PlGF, MCP-1, IL-6, and IL-8; PDGF-AA was significantly negatively correlated with the width of the main and branch veins; and the RFVs of the main artery and vein decreased significantly from before to 1 month after IRI. Conclusions: Contrary to expectations, the study found that anti-VEGF therapy does not affect RFV in arteries and veins in patients with BRVO and macular edema. Furthermore, retinal blood flow is poor in patients with high MCP-1, IL-6, and IL-8. Finally, high PDGF-AA may result in smaller venous diameters and reduced retinal blood flow.

Effect on ophthalmic imaging findings of flow-diverting stent treatment covering the origin of the ophthalmic artery.

Flow-diverting stents are devices that are increasingly used in the treatment of intracranial aneurysms and expand the spectrum of endovascular treatment. The patency of side branches and perforators is a major concern about flow-diverting stent (FDS) treatment. From 2011 to 2020, seventy-eight patients in whom the orifice of the ophthalmic artery was covered during FDS treatment were evaluated in this study. Bilateral retinal vascular parameters of study subjects were evaluated with OCT and OCTA. The FDS implanted-side eyes of the patients were defined as the procedure group, and the fellow eyes were considered as the control group. Twenty-seven patients who were treated with FDS covering the ostium of the ophthalmic artery and who could undergo full ophthalmologic examination were included in the study. There was no statistically significant difference found in terms of visual acuity, retinal vascular parameters, and choroidal thickness between the procedure group and the control group (p>0.05). However, in one case, recanalized retinal artery branch occlusion was detected on the side where the FDS was implanted. The orifice of the ophthalmic artery is often covered during FDS treatment for carotid-ophthalmic aneurysms; however, this treatment approach has no significant effect on ophthalmic vascular parameters.

Retinal vasculopathy following varicella zoster virus infection.

Varicella zoster virus (VZV) ocular infection can manifest purely as a vasculopathy that leads to retinal arteriole occlusion, without any retinitis or vasculitis. This review summarizes our current knowledge of such VZV ocular infection phenotype, incorporating initial descriptions from 1988. We describe the pathogenesis and VZV's manifestations in the retina using fundus photography, fundus fluorescein angiography, optical coherence tomography (OCT) and optical coherence tomography angiography (OCTA). Laboratory investigations, diagnostic procedures, prognoses, and treatment options are also being reviewed. Ten case reports where VZV retinal vasculopathy was the primary feature observed after varicella or zoster rash are described. The retinal arteriole, cilioretinal artery, branches of retinal artery, central retinal artery and ophthalmic artery were found to be areas of more rarely affected, neither in the form of vasculitis nor retinitis. Diagnosis is typically made from positive polymerase chain reaction (PCR) for VZV from extracted intraocular fluid or positive serum or cerebrospinal fluid (CSF) anti-VZV immunoglobulin G antibody in the context of compatible ocular findings. In addition, retinal vasculopathy occurring in the setting of confirmed varicella or zoster rashes could be considered potentially pathognomonic. Pathological concepts, including direct VZV infection of affected tissue, persistent inflammation, and/or virus-induced hypercoagulability are also discussed. VZV may produce a wide spectrum of ocular manifestations with isolated VZV retinal vasculopathy being a rarer presentation. A prompt diagnosis followed by an early treatment of systemic acyclovir with or without corticosteroids is the mainstay of treatment.

A case of branch retinal vein and artery occlusion following intranasal cocaine abuse

The known ocular effects of cocaine abuse include nystagmus and retinal vascular occlusions, among others. Retinal vascular occlusions are rarely seen in young adults and are thus generally associated with hypercoagulable disorders. Increasing rates of cocaine abuse in Western countries have led to increased reports of vascular complications. In addition to common vascular complications of myocardial infarction and stroke, cocaine-induced vasospasm can manifest in visual impairment. Previously, only two case reports of central retinal artery occlusion have been reported in intranasal cocaine abusers. This case report details combined branch retinal artery occlusion and branch retinal vein occlusion in one eye of an intranasal cocaine abuser. A 40-year-old man presented to our clinic with sudden painless nasal field loss of his left eye. The patient reported a recent history of intranasal cocaine use. Fundus examination showed intraretinal hemorrhage in the superior papillary, superior retina, temporal macula, and retinal thickening. We present a case of a patient with unilateral branch retinal vein and artery occlusions, possibly associated with induction of vascular spasm following cocaine abuse.

Abstract TMP59: Low Value Of Inherited Thrombophilia Testing Among Patients With Stroke Or Transient Ischemic Attack: A Single-institution Study

Background/Purpose: Inherited thrombophilia testing in the acute inpatient setting is controversial and expensive, and in many cases does not change clinical management. We sought to determine the value of inpatient inherited thrombophilia testing for patients who presented with an isolated acute ischemic stroke or transient ischemic attack (TIA) without concurrent venous thromboembolism. Methods: We retrospectively analyzed a database comprising patients who were admitted for acute ischemic stroke or TIA in 2019 at Thomas Jefferson University Hospitals in Philadelphia, PA and had inherited thrombophilia testing performed during the hospital admission. Charts were reviewed to determine stroke risk factors, test results, and clinical management. Results: The study included 102 patients (median age 49.0 years, 53.9% female) who presented with acute ischemic stroke or TIA (including branch and central retinal artery occlusions) and underwent inpatient testing for factor V Leiden, prothrombin G20210A variant, hyperhomocysteinemia, PAI-1 elevation, and deficiencies of protein C and S and antithrombin. 406 tests were ordered, among which 14.0% resulted abnormal, and 41.2% of patients had at least one abnormal test. Patients without stroke risk factors were more likely to have an abnormal result (60.0% vs 35.1%, P = .028). However, 40% of abnormal tests were borderline positive antigen or activity assays that likely represented false positives. Considering only definitively positive results, there was no significant difference in the likelihood of a positive test in patients with vs without stroke risk factors (32.0% vs 26.0%, P = .557) or those under vs over age 50 years (30.2% vs 24.5%, P = .519). No patients with an abnormal result had their clinical management changed as a result. Charges for the tests totaled $182,994 USD. Conclusions: Inpatient inherited thrombophilia testing immediately following isolated acute arterial ischemic stroke or TIA was associated with high rates of false positive results and was expensive. Positive results did not change clinical management in a single case.

Combined branch retinal vein and branch retinal artery occlusion in atrial septal defect

A 30-year-old male patient presented with branch retinal artery occlusion and branch retinal vein occlusion in his right eye. The patient had a history of atrial septal defect (ASD). A cardiology consultation was sought, and the patient was admitted for closure of moderate-grade ASD. Subsequently, his retinal hemorrhage showed improvement. Patients with branch retinal artery occlusion and branch retinal vein occlusion affecting the same retinal quadrant should be examined for heart issues to rule out an atrial septal defect.

Лечение эмболии ветви центральной артерии сетчатки при комбинированном аортальном стенозе в отдаленном послеоперационном периоде

Эмболия артерии сетчатки — известное возможное осложнение у пациентов с кальцинированным аортальным стенозом. Основой лечения окклюзий является восстановление кровотока. Высокая ассоциация с риском острых нарушений мозгового кровообращения, ограниченное время для оказания неотложной помощи, высокие риски при системном лечении, ухудшение качества зрения в перспективе являются особенностями данной группы пациентов. В работе представлен клинический случай эмболии нижней ветви центральной артерии сетчатки правого глаза у пациентки после кардиохирургического лечения комбинированного аортального порока с преобладанием выраженного стеноза и кальциноза. С учетом четкой визуализации кальцинированного эмбола в зоне окклюзии проведен лазерный эмболизис. Проходимость ветви центральной артерии сетчатки восстановлена частично из-за большого размера кальцинированного эмбола.

Central and Branch Retinal Artery Occlusion-Do They Harbor the Same Risk of Further Ischemic Events?

Purpose: Retinal artery occlusion (RAO) is associated with an increased risk of cardiovascular events such as ischemic stroke and myocardial infarction, but whether different RAO subtypes such as central retinal artery occlusion (CRAO) or branch retinal artery occlusion (BRAO) carry similar risk of these events is unclear. Our aim was to determine whether the risk of cardiovascular events differs between CRAO and BRAO. Methods: This single-center, retrospective study included 131 patients hospitalized in our clinic in 2010–2020 with CRAO or BRAO confirmed by ophthalmic examination. Data on demographics, previous ischemic stroke and myocardial infarction, comorbidities, the results of echocardiographic and ultrasound carotid artery examinations and laboratory tests were assessed. Data on ischemic stroke, myocardial infarction, and all-cause mortality occurring after RAO were obtained from the Polish National Health Service, which collects data on all publicly funded hospitalizations. Using these data, Kaplan-Meier analyses and Cox proportional hazard regression were performed. Results: Ischemic stroke occurred in 9.9% of patients after RAO: 10.6% in the CRAO group and 8.1% in the BRAO group (p = 0.662). Myocardial infarction occurred in 2.3% of patients after RAO: 2.1% in the CRAO group and 2.7% in the BRAO group (p = 0.843). All-cause mortality occurred in 22.9% of patients after RAO: 25.5% in the CRAO group and 16.2% in the BRAO group (p = 0.253). The composite endpoint of ischemic stroke, myocardial infarction, and all-cause mortality after RAO occurred in 28.2% of patients: 30.9% in the CRAO group and 21.6% in the BRAO group (p = 0.338). There was no difference between CRAO and BRAO in median time to ischemic stroke (32 vs. 76.4 months; p = 0.352), all-cause mortality (35.9 vs. 36.3 months; p = 0.876) or composite endpoint (37.5 vs. 41.5 months; p = 0.912) after RAO. The Kaplan-Meier analysis showed no differences between CRAO and BRAO in ischemic stroke, myocardial infarction, all-cause mortality, or the composite endpoint; similar results were obtained in analyses of patients with and without cardiovascular events before RAO. Conclusions: The prognosis for ischemic stroke, myocardial infarction, and all-cause mortality is similar in patients with CRAO and BRAO. Ischemic strokes occur with a similar frequency before and after RAO. Myocardial infarctions are observed significantly more frequently before an episode of RAO than after. The results of our study indicate that both CRAO and BRAO require expanded diagnostics to assess the risk of recurrent cardiovascular events, especially ischemic strokes, to implement appropriate prophylaxis and reduce mortality.

The U.S. Veterans Health Administration national giant cell arteritis (GCA) database cohort: incident ophthalmic complications in biopsy-negative GCA patients.

This study aimed to identify the incidence of ophthalmic complications of giant cell arteritis (GCA) among subjects with negative temporal artery biopsy (TAB) and to determine if duration of prednisone exposure relative to GCA diagnosis was associated with ophthalmic complications in TAB-negative subjects. The U.S. Veterans Health Administration (VHA) national database was queried for subjects between 1999 and 2017 with ICD-9/-10 diagnosis code for GCA, procedure code for TAB, and ICD-9/-10 diagnosis code for blindness, anterior or posterior ischemic optic neuropathy, or branch or central retinal artery occlusion. Pharmacy data regarding prednisone dispensation were collected. A Cox proportional hazard model was performed using ophthalmic complication by 1 year as the outcome variable in TAB-negative subjects, adjusting for age, TAB length, TAB laterality, and prednisone dose relative to GCA diagnosis date. Incident ophthalmic complication occurred by 1 year in 9.6% with positive TAB and in 6.2% with negative TAB. The majority of complications occurred within the first month for both groups. Compared to a reference group of prednisone initiation 0-14 days prior to GCA diagnosis, ophthalmic complications in TAB-negative subjects were significantly higher when prednisone initiation was delayed 14-28 days after GCA diagnosis. A substantial number of TAB-negative subjects accrued an incident ICD-9/-10 code for ophthalmologic complication within a year after diagnosis, most occurring within the first month. Delaying prednisone initiation 14-28 days after GCA diagnosis in TAB-negative subjects led to a 3.5-fold higher rate of ophthalmic events occurring by 1 year. Key Points • This study provides an incidence rate of ophthalmic complication by one year in biopsy-negative subjects suspected of having GCA. • Delaying prednisone initiation 14-28 days after GCA diagnosis in TAB-negative GCA subjects led to a 3.5-fold higher rate of ophthalmic events occurring by 1 year.

Vascular Microanatomy of Small Resolved Paracentral Acute Middle Maculopathy Lesions

To study microvascular characteristics of small resolved paracentral acute middle maculopathy (PAMM) lesions in fellow eyes of patients with unilateral retinal vein occlusion (RVO). Prospective cross-sectional study. Patients with prior unilateral branch or central RVO and OCT evidence of resolved PAMM in the fellow, otherwise normal, eye were recruited prospectively and imaged with OCT angiography (OCTA). The resolved PAMM lesions were identified as focal areas of inner nuclear layer thinning over an anteriorly displaced outer plexiform layer (OPL). En face OCTA projections showing the location and size of the resolved PAMM lesions were created using 2 OPL segmentation lines with -9-μm and 0-μm offsets, and the cumulative distribution was evaluated. Anterior to the resolved PAMM lesions, vessels in the superficial vascular plexus were traced to identify small arterioles supplying the affected areas. Cumulative spatial distribution on small resolved PAMM lesions. From 24 fellow eyes of 24 patients with unilateral RVO (15 men and 9 women; mean age, 62.1 ± 13.6 years), 152 resolved PAMM lesions were identified. Of these lesions, 130 (85.5%) were found within the perifoveal region, and only 12 (7.9%) were found within the temporal quadrant. Of 28 lesions analyzed, the arteriole supplying the affected area was a single side branch of a larger vessel, with only 3 supplied by a terminal branch. Small resolved PAMM lesions in fellow eyes of patients with unilateral RVO are most prevalentin perifoveal regions supplied by side branches of low-order retinal arteries.

Clinical Features and Factors Affecting the Success of Retinal Vasculitis Therapy

Introduction: Retinal vasculitis is an inflammatory eye condition that threatens vision. Inflammation occurs in the branches of retinal arteries, cause by primary ocular diseases or associated with other diseases. This study aims to describe clinical features and factors affecting therapeutic success in 52 patients with retinal vasculitis.
 Methods: This study was conducted using retrospective cohort in Retina Clinic of Cicendo Eye Hospital for vasculitis patients from January 1st- December 31st 2017. Data were collected retrospectively from the ophthalmic records of 52 patients (74 affected eyes). Descriptive analysis was performed on all data, chi-square and eksak fisher test were used to analyze risk factor and factors affecting the success of therapy.
 Result: Out of 529 vasculitis and vitreous hemorrhage cases, retinal vasculitis was found in 52 patients (9.8%). Mean age of retinal vasculitis patients were 42.3 years (range: 13-74 years). 35 patients (62.3%) were men and 22 patients (42.3%) had bilateral retinal vasculitis. Most patients (73%) had positive results for history of TORCH infections, and 23.76 % for tuberculosis. At initial presentation, almost all patients (93.2%) came with chief complaint of blurry vision, 42 patients (56.8%) came with baseline visual acuity £20/200. Vitreous hemorrhage was identified from retinal examination in 43 patients (58.1%). Therapeutic success was found better in patients with systemic involvement (74,1%).
 Conclusion: Despite limitation of facility in our hospital, therapeutic success rate of retinal vasculitis patients was quite good. Better laboratory investigation and other supporting examinations are still needed to obtain good therapeutic results and to conduct further study about the disease. Tuberculosis, TORCH, and autoimmune test are important examination when managing retinal vasculitis.

Correlation of ischemic ophthalmopathy with lacunar infarction.

To investigate the correlation of ischemic ophthalmopathy (IO) with lacunar infarction (LI), an ischemic lesions in the cerebrovascular system. Totally 204 cases of IO without any nervous system symptom and previously diagnosed LI served as the observational group. All 204 cases without IO, nervous system symptoms and previous LI served as the control group. Age and sex between the two groups matched well. LI was diagnosed by magnetic resonance imaging (MRI) and the results of the two groups were statistically analyzed and compared. IO included 174 eyes of 156 patients with non-arteritis anterior ischemic optic neuropathy (NAION), 42 eyes of 36 patients with central retinal artery occlusion (CRAO) or branch retinal artery occlusion (BRAO) and 12 eyes of 12 patients with ocular ischemia syndrome (OIS).The detection rate of LI (72.54%) in IO group was obviously higher than that (15.68%) in the control group (P<0.001). IO was positively correlated with LI (r=0.573, P<0.05). In addition, most infarction sites located in the basal ganglia (67.57%), which were not the vital areas of cerebrum and not easy to be found due to their small size. The majority of those first visited IO patients (72.54%) without nervous system symptom and previously diagnosed LI had already suffered from LI. According to our studies, there is a positive correlation between IO and LI. IO can be used as an important predictor for the present of LI, especially obvious signs of the patient.